A former coworker's brother-in-law ran into this. He was a finance officer and got laid-off back during the Great Recession. He found a position as the CFO of a dispensary, and one of the first problems he had to address was employees doing cash pickups from the stores using their personal cars. So there were people moving $20k+ daily in their Toyotas (not especially safe!)
So he called some of the armored car firms to inquire about hiring them, and they all turned him down flat because they didn't want the chance of his cash getting intermingled with that of Wells Fargo, etc. What he did was set up a wholly-owned subsidiary to do the transport, buying a couple of armored cars to move both the money and the product.